Implement for removing insulating-covering from electric-circuit wires.



No. 390,790. PATENTED MAR. '3, 1908. J. H. GOEHST. IMPLEMENT EOE REMOVING INSULATING COVERING FROM ELECTRIC CIRCUIT WIRES. AYPLIOATION FILED FEB. 25, 19 97.

2 sEEETs-sE ET 1.'

J. H. GOBHST.

PATENTED AR, s; 1908.

IMPLEMENT FOR REMOVING INSULATING COVERING FROMYELEGT'RIG CIRCUIT WIRES. APPLICATION FILED rm. 2a, 1907;

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' mentin the nature of 55 '1likelyzto. per-broken by'subsequent flexing.

STATES PATENT onrion.

immense -Toullrzbhomiitmay concern;-

4 Be it known thatI; Jon): Gonnsrja. citizen of the United-States; andaresident of Ghicago; in the county offookand State of 5 Illinoi s,-have invented certain new. and useful Improvements in Implements for Remov.- ing Insulating-Covering fro'm Electric-CircurhWiresgtmd I do hereby declare that the. .followingzisa'. full, "clear, and .exactdescripjo tioni thereof, reference being bad to'the ac-- companying drawings, and to the marks of referenced-hereon, ivhich" form a part of this specification. v V I This invention relates .to a novehiinpleliers intended for. use byfwire-men-in instalhng insulated electric circuit wires and has b tate the removal of the insulated circuit wires at points in'the 'wire Where connections are to be made with bind,-

tag tistsor other circuit-wires. 1

vi: improvements are adapted for use in "connection" with pliers ordinarily used by Wire-men for installing circuit wiresand m'ay oonstituteparts ofsuch pliers or attachments insulating cover from therefor: v

The invention consists in the matters here- "in'after set forth and more particularly pointd out injthe appended claims. Heretofore 1tEhas been the c ommon practicein remov ing the insulating covering from T f circuit wires-to strip the same by the use of anordinary pocket-knife, the insulation being GiI'CU'IHfQIGDtialLV i cut inwardly- "to the 'wire at the ends of:the sectionto be removed and the parts of the insulation between-said c'u ts being thereafteristripped fromthe wire by splitting orscraping away the-severed sect-ion longitudinally thereofun'til' the wire' 40 is bared on all sides. One serious objection foundin this practice is that, unless the insulation be. very carefully and skillfully stripped from the wire, there is great likelihoodof the wire being scratched or indented by the edge of theknifeeblade. This is highly objectionable because of the wellknown 'fact that the. cut-ting'or' abrasion of the skinof the wire robs it'of its flexible properties. "As aconsequence a wire cut or scratched in this manner is likely, to be broken. upon subsequent winding thereof aboutanother wire in makinga connection, cor iotherinanipulat-ion necessaryfor attachanent to-arondutorion binditng post. Fun eri ii'ore; a wire .possess ngthislatent defect r ,Speciiicationof Letters Patent. x application filei February 25. 1907. Seiia1No..-359.296.

een designed to facili-'- some, or. CHICAGO, ILLINOIS.

COVERING FBoM ELEcTRIo-cmcurr WIRES.

: i i I I I I of the wire, which may; occur by reason of 'movement tot-he parts to which it is attached, or as a consequence of continual vibra tion of the parts to which the wireis attached. The breaking or parting of a circuit wire under these circumstances brings about the formation of an are which results in burning away wound about such oints, with'the result of setting fire to adjacent combustible mate rials, and is the fruitful source of many serious fires which cannot be guarded against by the use of ordinary safety devices used in electric circuits; A further objection to the prior practice of stripping the insulation from the wlreis that it consumes an undueamount of time of skilled labor and is, therefore, an unnecessarily expensive operation.

It is the object of my invention to )rovide a novel implement in the nature of pliers by Which sections of insulation may be removed or stripped from the insulated circuit wires without danger of cutting or indenting the wire, and-which is also of such construction as to simplify and reduce the cost of this operation.

I have herein shown my invention as adapted to two common forms of )liers, and have also illustrated slight modifications in adapting the invention. It will be understood, however, that the essential features of the invention may be embodied in other forms of implements and the invention is not limited to the illustrated disclosures except as herein made the subject of specific claims.

In thedrawings: Figure 1 is a side elevation of a pair of pliers embodying my invention. Fig. 2 is a transverse-section, taken on line 2-2 of Fig. 1, looking toward the points of the jaws. Fig. .3 is a like section, lookin in the opposite direction. Fig- 4 is a detai section, taken on'line 44 of Fig. 2. Fig. -5 is a perspective view of a pair of the transverse cutter-blades by which the transverse severance of the insulation is effected. Fig. 6 illustrates one of the blades, by which the longitudinal slit of the section to be removed Fig. 7 is a view similar to Fig. 4, showing a modification. Fig. 8 is a side view of an- "other form of pliers showing my invention applied thereto. 9 is a cross-section, taken-on the line 9-9 of Fig. 8, looking in the. direction indicated b the arrows. Fig. '10 is a cross-section, taken on line -101O of Fig. 8, lookingin the direction inis effected, detached from the implement.

I Patented March. 3; 1 9Q 8, n l

the insulating tape usually 7 9. Fig. 12isa dicated by the tudinal section,

arrows. Fig. 11 is a longitaken on line 11-1l of Fig. erspective view of the transversely cutting lades used in the implement shown in Fig. 8. Fi 13 is a erspect ve view of one of the l ongitudina ly cuttmg blades of the modification, detached from the other arts. Fig. 14 is a view in elevation of a Fort length of an insulated electric circuit wire. Fig. 15 illustrates said wire after a section of the insulation has been severed, but not removed from the wire. Fig. 16 illustrates said wire after the section of insulation has been removed. Fig. 17 is a cross-section, taken on line 1717 of Fig. 1.3, illustrating the manner oi longitudinally severing the section to be removed. Fig. 18 is a similar section, showing the section cut longitudinally from one side only. Figs. 19, 20 and 21 are views similar to Figs. 14, 15 and 16 illustratin the cutting of a shorter length of the insu ating covering from a circuit wire.

In Fig. 14 is shown a short length of the insulated circuit wire referred to, comprising the central wire a and the surrounding cover or envelop a. manner in which I propose to sever the insulation preparatory to removing a section of the same. Thisoperation consists in effectilig two transverse or circular lines a of sev- I erance and one or two longitudinal lines a oi? severance extending longitudinally of the wire and joining the transverse lines of severance. The transverse lines of severance are eilected by two pairs of cutting blades located a distance apart equal to the length of the sections to be removed, the longitudinal line or lines of severance being eflected by the simultaneous action of a cutting blade or blades extending between the transverse blades. After the insulation has been cut, as shown in Figs. 15, 17 andlS, the segments of the insulation are removed by the use of the plier-jaws or analogous devices. Fig. 16 illustrates the length of wire after the has been removed, thus baring the desired length of the wire a. The circuit wire shown in 16 is stripped or bared for a length sutiicient to connect another wire by winding or coiling the other joining wire about said Figs. 20 and 21 is shown a wire in which a shorter section of the wire is bared or stripped for sim' le connection with a binding post or the li :e.

Referring first to implement shown in Figs. 1 to 5, both inclusive, 20, 20 designate the jaws of a common form of pliers, 21, 21 the handles thereof, and 22 the pin by which the jaws are hinged together. 23, 23 designate the transversely cutting blades before referred to for eiiecting the transverse or circular cuts c' in the insulation, and 24, 2 l'designate the cut- I one jaw In-Fig. 15 is illustrated the which the blades are disposed bared portion. In'

openings the construction of the ting blades for effecting or lines oi? severance a. The transverse cutting blades 23 are arranged in pairs, one pair at each side of the jaws. One blade of each pair is fixed to one awand the other to the other jaw. They are disposed at right angles to the meeting faces of the jaws in overlapping or shearing relation to each other. They are provided in their adjacent margins with notches 26, 26 of general V-shapc, the wider portions of which 0 en to said adjacent margins, shownbest in ig. 5, and at the sides of said notches with converging cutting edges. The en aging or overlapping faces 28, 28 of said blades are made flat and fit closely to each other, and the cutting edges 27 are located in the planes of faces. The' said cutting edges of the blades at the sides of. the V-shaped notches do not meet at acute angles, butthe bottoms of said notches are slightly rounded. They are so arranged on the upper and lower jaws of the pliers that, when rought together in shearing relation, they are arrested by contact of with the other in such manner as to leave between the bottoms or narrower parts of the V-shaped notches o enings betweenco-acting blades of a iameter slightly greater than that of the wire a. The openings between the blades of the two pairs are in alinement with each other. Thus the blades are brought together to sever the envelop of insulating material, but are stopped short of contact with the wire a. a The two pairs of co-acting blades at the opposite sides of v the. jaws are preferably spaced a distance apart to cut or sever a section of the insulating covering of the required length. may be attached to the jaws in any-suitable manner. As herein shown, said blades are made integral with cross-bars 29, 29, to at right angles. Said cross-bars fit in suitable notches 30 in the adjacent faces of the jaws, as more clearly shown in Fig. 4, and are attached thereto in any suitable manner, as by rivets '31 extending outwardly through the jaws.

The longitudinally cuttin blades 24, 24 which producethe longitudinal cuts a extend transversely across the jaws, one blade, being attached to one jawvand the other blade attached to the other jaw. The are located out of alinementwith the axes of the formed between the. V-sha )cd notches of the transversely cutting bla es. The inner or adjacent edges of sald longitudinally cutting blades are. knife edges and meet in shearing relation. of such width as to cut approximately through one-half of the diameter of the insulating covering. as shown in Fig. 17, thus completely severing a segment of the section to be removed at one side of the wire 0..

said overlapping The are made the longitudinal cuts in shearing relation I The said co-a-c-ting blades 23 cross-bars which esorzoo The said blades areherein shown as fixed in place by.be ngattached to or made integral said-blades. In this construction, therefore, the said blades 24 constitute, in eilect, the innerfheads of said rivets 31 and are clamped firmly against the inner faces of the connect said transversely cutting blades. i f

In Fig. is shown'a construction where but a single longitudinally cutting blade 33 is provided. In. this construction said blade opposes. and c'o-iac-ts with an' abutment con- "stituted by an elongated head 34 of one of the attaching rivets 31. When but asingle longitudinally cutting blade is used, it will preferably be made of someavha't greater width than the'blades 24, and produces a longitudinal cut in the insulating covering extending past the axis of the wire, as clearly shown in fig. 18

In Figs. 8 to 13, inclusive, I have shown my improvements as applied to a slightly different form of pliers. In this constructionthe j aws of the pliers are provided at one side thereof. in front of the side or transversely cutting blades 23, with cutting edges 35. 35 arranged longitudinally of the jaws for clipping or cutting wire. The said jaws are provided also at their points with transverse cutting edges 36. 36 for cutting wire in places difficult of access to other cutting, 35 tools.

In this construction the blades 23 are made somewhat narrower than those shown in Fig. 1 so as to set back of the cutting .or nipping edges 35 of the jaws. The

, longitudinally cutting blades are attached to the jaws by means of two integral shanks 37 that extend through apertures in the crossbars 29, laterally'outside of the jaws, and are riveted therein. The cross-bars carrying the blades23 are fastened to the jaws by screws 38. best shown in Figs. 10 and 11.

My said improvements may be arranged to be detachablyconnected with pliers of various styles. in which event the improvements constitute an attachment for the pliers. or

may be attached permanently to and made an integral part of the pliers or other analogous implement.

In the operation of the implement, the

wire from which a section of the insulation is to be stripped isadjusted between the jaws in line with the notches of the'side cutting blades and the pliers are then closed until arrested by contact of one of the jaws with the other. The device is so adjusted on the pliers, with respect to a given size wire, that when the jaws and blades are thus arrested, the insulation 18 transversely cut to the w1re 'in the manner shown in Figs. 15 and 20 and is longitudinally cut on one or both sides,

depending upon whether one or two longiwire that is to be wound about the same.

tudinally cutting blades be; employed as indicated ilr-Figs. 17 and 1 8:.- Thereafterthe severed section or sections ofthe insulation, are stripped or pulledfrom-the wire, as shown in Figs. 16 and 2l, hy=theruse of the points or. noses on sai'dnplier jaws. It is obviousthat this 0 eration may be rapidly effected to strip t 1e wire clean of the insulating cover, thereby eflecting a substantial saving of time and correspondingly reducing the cost of in-" stalling circuit wiress In. the implement shown in Figs. '1 to 6, inclusive, the two pairs of shearing blades are separated by but a narrow space, so that the section of insulation removed therefrom isa short one asv shown in Figs. 20 and 21. The wire thus, bared is designed for simple attachment to a binding screw, or the like. The implement shown in Figs. 8 t0.13, inclusive, is designed to cut a longer section of the insulating covering from the wire, asshown in Figs. 15 and 16. and adapted for connection with a it be desired to cut a section from the insulation of greater length "than the distance between the transversely cutting blades of either implements. such additional length may be severed by moving the cutter longitudinally along the wire after the first out has been made. Similarly a single pair of 9 side cutters may be employed, located at one' side of the jaws of the pliers and a section may be cut from the insulating covering by severing one end of said-section while holding the pliers in one position and thereafter reversing the position-of the pliers to sever the other end of thesection.v

I claim as my invention z- 1. An implement for removing the insulating covering from electric circuit wires comprising, in combination with swinging jaws, coacting blades at the side of said jaws, one carried by each. j aw, for transversely cutting the covering. andablade between the jaws for longitudinally splitting the covering and arranged and designed to split the said covering past the center of the wire. 4

2. An implement for removing the insulating covering from electric circuit .wires comprising, 111- comblnation with swinging j aws. co-acting blades at the side of the jaws for transversely cutting the covering, one carried by each jaw, said blades being provided with opposing notches, and at the side of said notches with inclined cutting edges, and a blade disposed transversely'betw'een the jaws for longitudinally splitting the CO"? ering, the splitting blade extending with its cuttingedge past'the bottom of said notches.

3. An implementfor removing the insulating covering from electric circuit wires.

con1prising,' in combination with swinging aws, co-acting blades at the side of the aws for transversely cut-ting the" 1 covering, one carr ed-by each jaw, said blades being pro- 7 pair at eachside of said jaws notches. for longitudinally splitting the. covering.

4. An implement for removing the insulating covering from electric circuit wires comprising, in combination with. hinged jaws, ctr-acting blades at the side of the jaws,for

transversely cutting the covering, one car-' ried' by each'jaw, and co-act-ing blades between t-ae aws, one carried by each aw, and

located at one side of the centers of said transversely cuttingblades, for longitudinally splitting the covering.

5. An implement for removing the insulating covering from electric circuit wires comprising, in combination with swinging jaws, two pairs of co-acting blades, one pair at each side of the jaws for transversely cutting the covering, one of the blades of each pair being carriedbyone jaw and the other by the other jaw, and a blade extending transversely between the side blades at one side of the centersof the transverse cutting blades for longitudinally splitting the covering.

6. An implement for removing the insulating covering from electric circuit wires comprising, in combination with swinging jaws, two pairs of co-acting blades, one pair at each side of the jaws for transversely cutting the covering, one of the blades of each pair being carried by one jaw and the other by the other jaw: and-two blades for longi tudinally splitting the covering, said latter blades being carried one by each of the jaws and extending between the side blades with their edges arranged inshearing relation.

' T. An implement for removing the insulating covering from electric circuit wires comprising, in' combination with swinging jaws, co-acting blades arranged in pairs, one for transversely cutting-the covering. bars integral with said blades and extending transversely across the jaws, ablade extending across the jaws between the said side pairs of blades for longitudinally splitting the covering and a single fastening device for fastening to the pliers the splitting blade and the bar carrying two of the transverse cutting blades.

8. The combination with the swinging jaws of a pair-of pliers, ofco-acting blades at the side of said jaws, one carried by each of said jaws, and provided with opposing notches having inclined cutting edges, and a blade extending transversely across the jaws atone side of the centers of said notches.

9. An attaclnnent for pliers for removing the insulating covering from electric circuit wires, comprising a side blade provided. With a notch having inclined cutting edges, combined with a cutting blade; fixed at right angles to said side blade at one side of the center of said notch.

, 10. An attachment forpliers for removing the insulating covering from electric circuit wires, comprising abar provided at its ends with angularly disposed blades having alined notches, the sides of which constitute cutting edges, combined with a blade extending be .tween the first mentioned blades in fixed relation thereto and located at one side of thecenters of said notches.

11. An attachment for pliers for removing insulating covering from electric circuit wires, comprising a bar provided at its ends with angularly disposed blades for transversely cutting the insulation. combined with a blade seated on said bar and extending between the first-mentioned blades for longitudinally splitting the insulating covering of the wire,

and a single fastening device for fastening said bar and splitting blade to the pliers,

12. An attachmentfor pliers for removing insulating covering from electric circuit wires, comprising a bar provided atpits ends with angularly disposed blades for transversely cutting the insulation. combined with a blade seated on said bar and extending between the first-mentioned blades for longitudinally splitting the insulating covering of the wire, a screw-threaded. device extending through the jaw of the pliers andsa-id bar for fastening said splitting blade and cross-bar to the plier jaw.

in testimony, that I claim the foregoing as my invention 1 affix my signature in the presence of two witnesses, this 9th day of February, A. 1)., 1907. 1

JOHN H. GOEHST.

\Yitnesses WILLIAM L. HALL, Gnonon R. WILKIXs. 

